I’ve pasted a mask as a motion path into the emitter’s XY position. My custom particle is an arrowhead made from a shape layer. I’ve reduced the emitter’s velocities down to zero and reduced the particles/sec count to 12 so I get a simple stream of arrow heads drawing on along a the pasted path. 

How can I get the arrowhead to follow the path in a perpendicular fashion?

Auto orienting the particle layer to a path doesn’t work as the path is on another layer. Is this even possible within Particular?

Thanks.